A very handy tool and the current best way i’ve found to test firewall rules is to fire up tcpdump. Check man for details but here is an example of monitoring a specific destination port and host on a specific NIC;

tcpdump -i eth1 dst port 22 and dst host 192.168.4.34

If you can see the traffic leaving the interface outbound it has made it past the firewall, if not then you need to have a look at your firewall rules or check your routing table. Type route to see current routing table